It's an adjective; "The smallest puppy" is the subject of the sentence as the rest of the sentence describes it. Of course the subject cannot just be "puppy" so it must include "The smallest" as well. Since smallest is an adjective (A word that describes something else,) that answer is Adjective.
The victim of a curse, became a lycanthrope so he was locked away in his cellar laboratory so he wouldn't hurt anyone.
He was the first president to make thanksgiving a national holiday
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